I recently added on to my house two bedrooms and a bathroom.  I needed another hot water supply and looked into these point-of-use hot water systems.  Way to expensive to fit into my construction budget considering the energy/cost saving over the long haul.  I opted for another tank.  My boss built a new house at about the same time and opted for the point-of-use system.  He had more money in his construction budget than I did.  So far he is satisfied.